Use the References to access important values if needed for this question. A vol

Question

Use the References to access important values if needed for this question.

A voltaic cell is constructed from a standard Sn2+|Sn half cell (E°red = -0.140V) and a standard Cl2|Cl- half cell (E°red = 1.360V).

The anode reaction is:

The cathode reaction is:

The spontaneous cell reaction is:

The cell voltage is ________ V.

(2) Is this reaction reactant or product favored under standard conditions?

_________reactantproduct

(3) If the reaction is product favored, is it enthalpy favored, entropy favored, or favored by both enthalpy and entropy? If the reaction is reactant favored, choose 'reactant favored'.

(2) Is this reaction reactant or product favored under standard conditions?

_________reactantproduct

(3) If the reaction is product favored, is it enthalpy favored, entropy favored, or favored by both enthalpy and entropy? If the reaction is reactant favored choose 'reactant favored'.

Explanation / Answer

Part A.

number of electrons involved : 2 e-

Anode reaction : 2Cl-(aq) ----> Cl2(g) + 2e-

Cathode reaction : Sn2+(aq) + 2e- -----> Sn(s)

Spontaneous reaction : Sn2+(aq) + 2Cl-(aq) -----> Cl2(g) + Sn(s)

Eocell = 1.360 -(-0.140) = 1.500 V [Eocell must be +ve for a spontaneous reaction]

Part B.

(1) dS(universe) = dS(system) + dS(surrounding)

dS(surrounding) = -1.719/2 x 746600/298.15 J/K

dS(universe) = (1.719/2 x 198.0) + (-1.719/2 x 746600/298.15) = 170.181 - 2152.2814 = -1982.10 J/K

(2) In this reaction, under standard conditions, reactants formation is favoured as dG is +ve, non-spontaneous reaction.

(3) 'reactant favoured'

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